title: Kinetic latex agglutinometry II: a rapid, quantitative assay for factor VIII antigen.
abstract: A rapid method for measuring factor VIII antigen in plasma is presented, based upon optical measurement of the rate of agglutination of a stirred suspension of latex particles coated with anti-factor VIII immunoglobulin, when mixed with plasma containing factor VIII antigen. A log-log relationship exists between factor VIII concentration and the reciprocal of the time required for a fixed absorbance change. The assay is rapid, requiring less than 3 min for normal plasma, involves stable reagents, and can be performed with conventional instrumentation. Antigen values in normal plasma a well as plasma from patients with von Willebrand's disease (angiohemophilia) correlate well with values measured by electroimmunoassay or by radioimmunoassay.
mesh_terms: D000371:Agglutination; D000941:Antigens / Q000032:analysis*; D005169:Factor VIII / Q000032:analysis / Q000276:immunology*; D006801:Humans; D007118:Immunoassay; D007700:Kinetics; D007840:Latex; D011863:Radioimmunoassay / Q000379:methods; D012016:Reference Values; D014842:von Willebrand Diseases / Q000276:immunology; D014841:von Willebrand Factor
chemical_list: D000941:Antigens; D007840:Latex; D014841:von Willebrand Factor; D005169:Factor VIII